PDF / .TXT malware analysis — malicious · f9ede07945e0e23e

MALICIOUS

PDF / .TXT

4.1 KB

MD5: e8514d604cfef42325efaa0884d127b9 SHA-1: e464206447f5ab66384654371d0dc259ed8d697a SHA-256: f9ede07945e0e23e200ca8cd390ce758c7914c74c8e0137aafedf024fc6d7707

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness (0.999991). The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), common techniques for hiding malicious code. The extracted JavaScript files, 'javascript_obj0013_001.js' and 'acroform_b64_00.js', are likely responsible for executing the malicious payload, potentially by downloading and running additional malware. The exact payload and delivery mechanism are not fully discernible due to obfuscation, leading to a slightly reduced confidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `447b233cd8296658d2fc6251afe63a3d79ee9b3ecef8f30976fd6f2973b0c5cf`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6409 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `6ab972eb9649037aa124e2ecaae4cb2085203acc305ed129123c57192aef60dc`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3652 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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